Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica
Abstract Perennially ice-covered lakes that host benthic microbial ecosystems are present in many regions of Antarctica. Lake Untersee is an ultra-oligotrophic lake that is substantially different from any other lakes on the continent as it does not develop a seasonal moat and therefore shares simil...
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2020
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Online Access: | http://dx.doi.org/10.1038/s41598-020-69116-6 http://www.nature.com/articles/s41598-020-69116-6.pdf http://www.nature.com/articles/s41598-020-69116-6 |
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crspringernat:10.1038/s41598-020-69116-6 2023-05-15T14:06:00+02:00 Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica Marsh, Nicole B. Lacelle, Denis Faucher, Benoit Cotroneo, Sarina Jasperse, Liam Clark, Ian D. Andersen, Dale T. Natural Sciences and Engineering Research Council of Canada Tawani Foundation 2020 http://dx.doi.org/10.1038/s41598-020-69116-6 http://www.nature.com/articles/s41598-020-69116-6.pdf http://www.nature.com/articles/s41598-020-69116-6 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Scientific Reports volume 10, issue 1 ISSN 2045-2322 Multidisciplinary journal-article 2020 crspringernat https://doi.org/10.1038/s41598-020-69116-6 2022-01-04T07:19:21Z Abstract Perennially ice-covered lakes that host benthic microbial ecosystems are present in many regions of Antarctica. Lake Untersee is an ultra-oligotrophic lake that is substantially different from any other lakes on the continent as it does not develop a seasonal moat and therefore shares similarities to sub-glacial lakes where they are sealed to the atmosphere. Here, we determine the source of major solutes and carbon to Lake Untersee, evaluate the carbon cycling and assess the metabolic functioning of microbial mats using an isotope geochemistry approach. The findings suggest that the glacial meltwater recharging the closed-basin and well-sealed Lake Untersee largely determines the major solute chemistry of the oxic water column with plagioclase and alumino-silicate weathering contributing < 5% of the Ca 2+ –Na + solutes to the lake. The TIC concentration in the lake is very low and is sourced from melting of glacial ice and direct release of occluded CO 2 gases into the water column. The comparison of δ 13 C TIC of the oxic lake waters with the δ 13 C in the top microbial mat layer show no fractionation due to non-discriminating photosynthetic fixation of HCO 3 – in the high pH and carbon-starved water. The 14 C results indicate that phototrophs are also fixing respired CO 2 from heterotrophic metabolism of the underlying microbial mats layers. The findings provide insights into the development of collaboration in carbon partitioning within the microbial mats to support their growth in a carbon-starved ecosystem. Article in Journal/Newspaper Antarc* Antarctica Springer Nature (via Crossref) Untersee ENVELOPE(13.467,13.467,-71.350,-71.350) Scientific Reports 10 1 |
institution |
Open Polar |
collection |
Springer Nature (via Crossref) |
op_collection_id |
crspringernat |
language |
English |
topic |
Multidisciplinary |
spellingShingle |
Multidisciplinary Marsh, Nicole B. Lacelle, Denis Faucher, Benoit Cotroneo, Sarina Jasperse, Liam Clark, Ian D. Andersen, Dale T. Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica |
topic_facet |
Multidisciplinary |
description |
Abstract Perennially ice-covered lakes that host benthic microbial ecosystems are present in many regions of Antarctica. Lake Untersee is an ultra-oligotrophic lake that is substantially different from any other lakes on the continent as it does not develop a seasonal moat and therefore shares similarities to sub-glacial lakes where they are sealed to the atmosphere. Here, we determine the source of major solutes and carbon to Lake Untersee, evaluate the carbon cycling and assess the metabolic functioning of microbial mats using an isotope geochemistry approach. The findings suggest that the glacial meltwater recharging the closed-basin and well-sealed Lake Untersee largely determines the major solute chemistry of the oxic water column with plagioclase and alumino-silicate weathering contributing < 5% of the Ca 2+ –Na + solutes to the lake. The TIC concentration in the lake is very low and is sourced from melting of glacial ice and direct release of occluded CO 2 gases into the water column. The comparison of δ 13 C TIC of the oxic lake waters with the δ 13 C in the top microbial mat layer show no fractionation due to non-discriminating photosynthetic fixation of HCO 3 – in the high pH and carbon-starved water. The 14 C results indicate that phototrophs are also fixing respired CO 2 from heterotrophic metabolism of the underlying microbial mats layers. The findings provide insights into the development of collaboration in carbon partitioning within the microbial mats to support their growth in a carbon-starved ecosystem. |
author2 |
Natural Sciences and Engineering Research Council of Canada Tawani Foundation |
format |
Article in Journal/Newspaper |
author |
Marsh, Nicole B. Lacelle, Denis Faucher, Benoit Cotroneo, Sarina Jasperse, Liam Clark, Ian D. Andersen, Dale T. |
author_facet |
Marsh, Nicole B. Lacelle, Denis Faucher, Benoit Cotroneo, Sarina Jasperse, Liam Clark, Ian D. Andersen, Dale T. |
author_sort |
Marsh, Nicole B. |
title |
Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica |
title_short |
Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica |
title_full |
Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica |
title_fullStr |
Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica |
title_full_unstemmed |
Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica |
title_sort |
sources of solutes and carbon cycling in perennially ice-covered lake untersee, antarctica |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1038/s41598-020-69116-6 http://www.nature.com/articles/s41598-020-69116-6.pdf http://www.nature.com/articles/s41598-020-69116-6 |
long_lat |
ENVELOPE(13.467,13.467,-71.350,-71.350) |
geographic |
Untersee |
geographic_facet |
Untersee |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Scientific Reports volume 10, issue 1 ISSN 2045-2322 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-020-69116-6 |
container_title |
Scientific Reports |
container_volume |
10 |
container_issue |
1 |
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1766277772049645568 |